Mitsubishi Electric MELDAS C6 Programming Manual page 297

14. Coordinates System Setting Functions
Detailed description
(1) The second, third, or fourth reference (zero) point return is specified by P2, P3, or P4. A
command without P or with P0, P1, P5 or a greater P number is ignored, returning the tool to
the second reference (zero) point.
(2) In the second, third, or fourth reference (zero) point return mode, as in the first reference
(zero) point return mode, the tool returns to the second, third, or fourth reference (zero) pint via
the intermediate point specified by G30.
(3) The second, third, and fourth reference (zero) point coordinates refer to the positions specific
to the machine, and these can be checked with the setting and display unit.
(4) If G29 is specified after completion of returning to the second, third, and fourth reference
(zero) points, the intermediate position used last is used as the intermediate position for
returning by G29.
(5) With reference (zero) point return on a plane during compensation, the tool moves without tool
diameter compensation (zero compensation) from the intermediate point. with a subsequent
G29 command, the tool moves with tool diameter compensation until the G29 command from
the intermediate point.
Programmed path
G30P3Xx
14.8 2nd, 3rd and 4th reference (zero) point return
-X
Intermediate point (x
R#3
3rd reference (zero) point
-X
Tool nose center Intermediate point
path
Yy ;
1 1
(x ,y )
1 1
G29Xx
R#1
,y )
1 1
G30P3Xx Yy ;
1 1
G29Xx Yy ;
2 2
(x ,y )
2 2
Yy ;
2 2
(x ,y )
2 2
289
1st reference (zero)
point
-Y
R#3
3rd reference (zero) point
-Y